MacBook Air M1 dual screen update ?

Is it just me or apple has released an update who unlock duals screen for MacBook Air ? Previously when I plugged my external screen at a resolution of 3840*1080, the screen was duplicated exactly on both screen at the same aspect ratio. So the internal screen of my MacBook wasn’t utilized because of lack of resolution. It was due to a « hardware » limitation of the M1 chip (1 graphical core disabled during the fabric process because he wasn’t operating correctly). But recently when I plugged my external screen I can use both screen at optimal resolution wit two dirrerent desktops (they aren’t duplicated but splitted). Have you also noticed this recent update ?